Loyola, California has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 48.2 °F (low) to 71.4 °F (high). Annual precipitation averages 19.1 Inches. Loyola is located in USDA Plant Hardiness Zone 9b.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 41.2 °F | 59.5 °F | 3.96 in. |
| February | 42.5 °F | 62.1 °F | 4.21 in. |
| March | 44.5 °F | 65.7 °F | 2.73 in. |
| April | 46.2 °F | 68.8 °F | 1.33 in. |
| May | 49.8 °F | 74.2 °F | 0.45 in. |
| June | 52.8 °F | 79.9 °F | 0.13 in. |
| July | 55.4 °F | 82.5 °F | 0.0 in. |
| August | 55.6 °F | 82.0 °F | 0.05 in. |
| September | 54.3 °F | 81.4 °F | 0.07 in. |
| October | 50.4 °F | 76.0 °F | 0.75 in. |
| November | 44.5 °F | 66.0 °F | 1.74 in. |
| December | 40.7 °F | 59.0 °F | 3.71 in. |
| Annual | 48.2 °F | 71.4 °F | 19.13 in. |
| Average First Frost Date | Frost Rare |
| Average Last Frost Date | |
| Average Days With Frost | Frost Rare |
| Plant Hardiness Zone | Zone 9b : 25°F to 20°F |
| Plant Hardiness Zone - 2012 | Zone 9b : 25°F to 20°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |